var navImageSwapHash = new Array();
     navImageSwapHash['navGoButton'] = 'url(/images/navGoButtonStates__V1615192_.gif)';
 
     function shiftImage(panelId,ho,vo,imgId){
       var pos = ho + 'px '+ vo +'px';
       var element = document.getElementById(panelId);
       element.style.backgroundImage= navImageSwapHash[imgId];
       element.style.backgroundColor='transparent';
       element.style.backgroundPosition=pos;
     }